Chelidonium, commonly known as celandines or swallowworts, is a small genus of flowering plants in the poppy family Papaveraceae, placed in the order Ranunculales. The genus comprises just two accepted species: Chelidonium majus (greater celandine) and Chelidonium asiaticum, and is native to northern Africa and Eurasia, ranging from western Europe across to east Asia.
Plants in this genus are herbaceous perennials with an erect habit. The leaves are alternate and deeply pinnate with lobed, wavy margins and a distinctive blue-green colour. A characteristic feature of the genus is the yellow to orange latex that the plants exude when any part is injured. Flowers are four-petalled and bright yellow, appearing in umbelliform cymes from late spring through summer. The small black seeds bear elaiosomes — fatty appendages that attract ants, which disperse the seeds through myrmecochory.
Chelidonium majus, the more widespread of the two species, reaches 30–120 cm in height and is native to most of Europe, western Asia, and parts of North Africa. It was formally described by Carl Linnaeus in Species Plantarum in 1753. It has been introduced widely in North America, where it is considered an aggressive invasive in some regions. Chelidonium asiaticum has a more easterly distribution centred on Asia.
The genus should not be confused with lesser celandine (Ficaria verna), which belongs to the entirely unrelated family Ranunculaceae.
Etymology
The name Chelidonium derives from the Ancient Greek χελιδόνιον (chelidṓnion), itself from χελιδών (chelidṓn) meaning 'swallow'. Ancient writers held that the plant bloomed when swallows arrived in spring and faded when they departed, giving rise to the common name swallowwort. The English name celandine traces the same path through Latin chelidonium and Late Latin celidonia.
Distribution
Chelidonium is native to northern Africa and Eurasia, broadly distributed from western Europe east to China and Korea. Chelidonium majus extends through most of Europe, western Asia (including the Caucasus, Kazakhstan, Mongolia, Siberia, Iran, and Turkey), and pockets of North Africa (Macaronesia, Algeria, Morocco). It grows on rocky slopes, in woodlands, and along roadsides and waste areas. The species has been introduced widely in North America, where it is now naturalised and in some areas invasive.
Ecology
Chelidonium majus seeds are dispersed by ants (myrmecochory) via fatty elaiosomes attached to each seed. The plant has naturalised across North America and is classified as a restricted invasive species in Wisconsin; management focuses on removal or herbicide application before seed dispersal. Its preferred habitats include rocky slopes, open woodlands, roadsides, and disturbed or waste ground.
Taxonomy Notes
The genus Chelidonium was formally established and its primary species, C. majus, described by Carl Linnaeus in Species Plantarum (1753). It sits in the family Papaveraceae, order Ranunculales. Despite the shared common name, lesser celandine (Ficaria verna) is not closely related — it belongs to Ranunculaceae. C. majus carries 29 synonyms across its two subspecies.
